AWS-Certified-Developer-Associate Free Practice Test

- (Exam Topic 2)
Queries to an Amazon DynamoDB table are consuming a large amount of read capacity. The table has a significant number of large attributes. The application does not need all of the attribute data.
How can DynamoDB costs be minimized while maximizing application performance?

1. A. Batch all the writes, and perform the write operations when no or few reads are being performed.
2. B. Create a global secondary index with a minimum set of projected attributes.
3. C. Implement exponential backoffs in the application.
4. D. Load balance the reads to the table using an Application Load Balancer.

Correct Answer: C
https://docs.aws.amazon.com/AWSEC2/latest/APIReference/query-api-troubleshooting.html

- (Exam Topic 2)
A Developer must analyze performance issues with production-distributed applications written as AWS Lambda functions. These distributed Lambda applications invoke other components that make up the applications.
How should the Developer identify and troubleshoot the root cause of the performance issues in production?

1. A. Add logging statements to the Lambda functions, then use Amazon CloudWatch to view the logs.
2. B. Use AWS Cloud Trail and then examine the logs
3. C. Use AWS X-Ray, then examine the segments and errors
4. D. Run Amazon Inspector agents and then analyze performance

Correct Answer: C
https://aws.amazon.com/blogs/developer/new-analyze-and-debug-distributed-applications-interactively-using-aw

- (Exam Topic 2)
A developer is migrating code to an AWS Lambda function that will access an Amazon Aurora MySQL database.
What is the MOST secure way to authenticate the function to the database?

1. A. Store the database credentials as encrypted parameters in AWS Systems Manager Parameter Store Obtain the credentials from Systems Manager when the Lambda function needs to connect to the database
2. B. Store the database credentials in AWS Secrets Manager Let Secrets Manager handle the rotation of the credentials, as required
3. C. Store the database credentials in an Amazon S3 bucket that has a restrictive bucket policy for the Lambda role only when accessing the credentials Use AWS KMS to encrypt the data
4. D. Create a policy with rds-db connect access to the database and attach it to the role assigned to the Lambda function

Correct Answer: B

- (Exam Topic 1)
Company D is running their corporate website on Amazon S3 accessed from http//www.companyd.com. Their marketing team has published new web fonts to a separate S3 bucket accessed by the S3 endpoint
https://s3-us-west-1.amazonaws.com/cdfonts. While testing the new web fonts, Company D recognized the
web fonts are being blocked by the browser.
What should Company D do to prevent the web fonts from being blocked by the browser?

1. A. Enable versioning on the cdfonts bucket for each web font
2. B. Create a policy on the cdfonts bucket to enable access to everyone
3. C. Add the Content-MD5 header to the request for webfonts in the cdfonts bucket from the website
4. D. Configure the cdfonts bucket to allow cross-origin requests by creating a CORS configuration

Correct Answer: D
https://docs.aws.amazon.com/AmazonS3/latest/dev/cors.html

- (Exam Topic 1)
A Developer is designing a fault-tolerant environment where client sessions will be saved. How can the Developer ensure that no sessions are lost if an Amazon EC2 instance fails?

1. A. Use sticky sessions with an Elastic Load Balancer target group.
2. B. Use Amazon SQS to save session data.
3. C. Use Amazon DynamoDB to perform scalable session hadling.
4. D. Use Elastic Load Balancer connection draining to stop sending requests to failing instances.

Correct Answer: C